The report itself is event better than the article:
https://www.ohchr.org/sites/default/files/documents/hrbodies/hrcouncil/sessions-regular/session59/advance-version/a-hrc-59-47-aev.pdf
Key terminology
“Sex” is understood as a biological category and as a distinction between women and men, as well as between boys and girls. References to “sex” refer to the biological distinction between males and females, characterized by divergent evolved reproductive pathways through which, all else being equal, males develop bodies oriented around the production of small gametes and females develop bodies oriented around the production of large gametes.
As evolutionary biologist Richard Dawkins notes: “Sex is a true binary. It all started with the evolution of anisogamy – sexual reproduction where the gametes are of two discontinuous sizes: macrogametes or eggs, and microgametes or sperm.”
The term “gender”, on the other hand, has been defined by the Committee on the Elimination of Discrimination against Women as the social meanings given to biological sex differences. It is supplementary to and built upon biological differences between women and men. It refers to the stereotyped roles, attitudes, prejudices and social and cultural practices that result in the subordination of women to men. In the last few decades, the term “gender”
has wrongly been taken to be synonymous with the term “sex”, including in some international declarations and instruments.